Shaft and plunger connection.



PATENTED MAR. 28, 1905.

W. G. SGHOELKOPF. SHAFT AND PLUNGER UONNEGTION.

APPLICATION FILED SEPT. 28.1904.

Patented March 28, 1905.

PATENT OFFICE.

WILLIAM C. SOHOELKOPF, OF MADISON, WISCONSIN.

SHAFT AND PLUNGER CONNECTION.

SPECIFICATION forming part of Letters Patent No. 785,7 6?, dated March28, 1905.

Application filed September 26,1904. Serial No. 226.095.

To all whom it may concern.-

Be it known that 1, WILLIAM C. ScHo ELKOPF, a citizen of the UnitedStates, residing at Madison, in the county of Dane and State ofWiseonsin, have invented new and useful Improvements in Shaft andPlunger Connections, of which the following is a specification.

This invention is a device for regulating the length of stroke of areciprocating element-- such as a pump-plunger, a piston, or the likedriven by a rotating element, such as an eccentric or crank. It isparticularly applicable and useful for regulating the length of strokeof plungers in oil-pumps and force-feed lubricators. Instead of having afixed connection between the plunger and the crank or eccentric-strap aslot is made in the head of the plunger or reciprocating rod, in whichslot the crank-pin or the eccentric-strap pin is movable to lose part orall of its motion, thus decreasing the length of stroke. The extent ofthis lost motion is limited by an adjustingscrew to the degree desired,and if a full stroke is wanted it can be effected by proper adjustmentof said screw.

The invention is illustrated in the accompanying drawings, in whichFigure 1 is a front elevation, and Fig. 2 is a side elevation, asapplied to a plunger driven by an eccentric. Fig. 3 is a side elevationof p a modification, showing the invention applied to a crank-drivenplunger.

Referring specifically to the drawings, 6 indicates a reciprocatingelement, such as a pump-plunger, having a flexible connection at 7 witha yoke 8. This flexible connection takes care of the lateral motion oroscillation and is particularly desirable in automobile work, wherevibration tends to get the parts out of exact alinement. The drive-shaftis indicated at 9, carrying the eccentric 10. The eccentric-strap 1 1has a projecting arm 12, which articulates by a ball-and-socket joint at13 with one branch of the yoke 8. Projecting from the eccentric-strap onthe side opposite to the arm 13 is a pin 14, which extends into a slot15, produced in the other branch of the yoke. The slot extends inalinement with the line of reciprocation of the eccentric-strap andplunger, and the pin is slidable in the slot to the extent permitted bya square-headed adjusting-screw 16, which is tapped into the end of thebranch of the yoke. A fiat spring 17 bears against the head of the screwand holds it as adjusted; but the spring is flexible enough to give whenthe screw is turned by force.

hen the eccentric-strap is vibrated by retation of the shaft, theplunger will lose motion until the pin strikes either the bottom of theslot or the foot of the adj Listing-screw, and when it does so strikethe plunger will reciprocate accordingly, and the extent of this lostmotion will be variable, according to the position of theadjusting-screw, to any degree between the loss of all motion and thefull throw of the eccentric.

It is noticeable in the construction shown in Figs. 1 and 2 that theball-and-socket joint 13 and the loose fit of the pin 14 in the slotallow a swing on a transverse axis, accommodating any variation in anglebetween the axis of the plunger and the axis of the shafts due tovibration or otherwise.

In a modification shown in Fig. 3 a crankdisk 18 is mounted on the shaft9 instead of the eccentric shown in the other figures. The crank-pin 19of this disk fits in the slot 15, and by means of the adjusting-screw 16the length of stroke is varied as desired.

hat I claim as new, and desire to secure by Letters Patent, is

1. The combination with a shaft and an cecentric and its strap thereon,of a reciprocating element, and a connecting member pivoted to the saidelement and to the eccentricstrap, the pivotal connection between saidmember and strap being adjustable to vary the stroke of said element. I

2. The combination with a shaft, and a reciprocating element driventhereby, of a flexible connection therebetween adj ustable to vary thelength of stroke of the latter and having vibration or oscillation in aplane parallel to the axis of the shaft.

3. The combination with a shaft, of a reciprocating element, having aslot at the head thereof, a device for converting the rotary motion ofthe shaft into reciprocating motion,

having a pin working in said slot, to lose motion, and means to vary thelength of the slot, to change the amount of lost motion.

4:. The combination with a shaft, and a reciprocating element driventhereby, of a device between the former and the latter, constructed toconvert and transmit the motion, and to produce lost motion, and meansto vary the amount of such lost motion.

5. The combination with a shaft, and an eccentric thereon, of areciprocating element having a yoke at the head thereof, and aneccentric-strap on the eccentric, pivoted between i the branches of theyoke, to permit variation having a pin slidable in the said slot in theother. i

8. The combination with a shaft and a reeiprocating element, of a yokeconnected to the latter, an eccentric and its strap between the shaftand yoke, the eccentric-strap being pivoted to one branch of the yokeand having a slot-and-pin connection with the other, permitting lostmotion, by slide of the pin in the slot and means to vary the extent ofsaid slide.

9. The combination with a shaft and a reciprocating element, of a yokepivotally connected to the latter and having a slot in one of itsbranches, an eccentric and its strap on the shaft, the strap having auniversal joint with one branch of the yoke and a pin slidable in theslot in the other, and an adjustings'crew extending into the slot, tovary the extent of said slide.

In testimony whereof I have signed my name to this specification in thepresence of two sub scribing witnesses.

WILLIAM C. SOHOELKOPF.

\Vitnesses:

PAUL F. NIEBUHR, JNo. J. PASCHKE.

